MC74AC540NG

Overview

The MC74AC540NG is an octal buffer and line driver manufactured by onsemi, featuring three-state outputs. It operates within a supply voltage range of 2.0 V to 6.0 V and supports an operating temperature from -40°C to +85°C. The device provides inverted outputs with a maximum quiescent supply current of 80 µA at 5.5 V. It delivers output currents of ±24 mA and exhibits propagation delays of up to 7.5 ns at 3.3 V and 6.0 ns at 5.0 V. Packaged in a SOIC-20 wide format (Case 751D), it utilizes a flow-through architecture.

Feature Summary

• Features three-state outputs that allow the device to switch between high, low, and high-impedance states for bus isolation.
• Utilizes a flow-through architecture where inputs and outputs are located on opposite sides of the package to facilitate microprocessor interface and PCB layout.
• Provides inverted logic outputs for signal buffering and driving applications.

Applications

• Memory and address drivers
• Clock drivers
• Bus-oriented transmitter/receivers

Procurement Notes

Verify the specific ordering suffix against official documentation to confirm package type and shipping quantity. Confirm RoHS compliance status and moisture sensitivity level requirements prior to integration. Ensure the selected variant matches the required input/output polarity and voltage specifications for the target application environment.

Selection Notes

Select this component when designing systems requiring octal buffering with high-density layout constraints. The flow-through pinout is advantageous for microprocessor output ports. Compare against non-inverting variants like the MC74AC541 if signal inversion is not desired. Verify compatibility with system voltage levels and load requirements.

Part Context

This device belongs to the MC74AC540/74ACT540 series of octal buffers and line drivers. It shares functional similarities with the MC74AC240 and MC74AC244 families but distinguishes itself through its specific flow-through pin arrangement. This configuration is optimized for ease of layout and increased printed circuit board density in digital logic designs.

Replacement Considerations

MC74AC541DWG: Non-inverting version of the same family.

FAQ

What is the logic polarity of the MC74AC540?

The MC74AC540 provides inverted outputs, whereas the MC74AC541 provides non-inverted outputs.

How does the package architecture benefit circuit design?

The inputs and outputs are located on opposite sides of the package, allowing for easier interface to microprocessors and greater PC board density.